Toothbrush head with dual lateral concave sides



FIG. 1 is a perspective view of a toothbrush head with dual lateral concave sides showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a front elevation view thereof; and,

FIG. 6 is a rear elevation view thereof.

The broken lines showing a handle, bristles, and the convex projections are included to illustrate environmental structure of the toothbrush head that forms no part of the claimed design. 

The ornamental design for a toothbrush head with dual lateral concave sides, as shown and described. 